问题补充：
Water, we cannot live, exists in the form of liquid, gas or solid.
A. from which
B. on which
C. by which
D. without which
答案：
A. from which
B. on which
C. by which
(答案→)D. without which
解析：考查定语从句：先行词是water，根据句意：我们的生存不能缺少的水，是以液体，气体或固体存在的。定语从句中缺少介词without water，用without which引导定语从句，选D。
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